skeleton for a canvas button
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libs/canvas/button.cc
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192
libs/canvas/button.cc
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/*
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Copyright (C) 2017 Paul Davis
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Author: Carl Hetherington <cth@carlh.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <iostream>
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#include "canvas/button.h"
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#include "canvas/canvas.h"
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#include "canvas/debug.h"
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#include "canvas/button.h"
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#include "canvas/text.h"
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#include "gtkmm2ext/utils.h"
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using namespace std;
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using namespace ArdourCanvas;
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using namespace Gtkmm2ext;
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using namespace Cairo;
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Button::Button (Canvas* canvas, double w, double h, Pango::FontDescription const & font_description)
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: Rectangle (canvas)
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, width (w)
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, height (h)
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, _label (new Text (canvas))
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, prelight (false)
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, highlight (false)
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, clicking (false)
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{
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_label->set_font_description (font_description);
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init ();
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}
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Button::Button (Item* parent, double w, double h, Pango::FontDescription const & font_description)
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: Rectangle (parent)
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, _label (new Text (this))
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, prelight (false)
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, highlight (false)
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, clicking (false)
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{
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_label->set_font_description (font_description);
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init ();
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}
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Button::Button (Canvas* canvas, std::string const & str, Pango::FontDescription const & font_description)
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: Rectangle (canvas)
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, _label (new Text (canvas))
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, prelight (false)
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, highlight (false)
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, clicking (false)
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{
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_label->set_font_description (font_description);
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_label->set (str);
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init ();
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}
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Button::Button (Item* parent, std::string const & str, Pango::FontDescription const & font_description)
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: Rectangle (parent)
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, _label (new Text (this))
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, prelight (false)
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, highlight (false)
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, clicking (false)
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{
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_label->set_font_description (font_description);
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_label->set (str);
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init ();
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}
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void
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Button::init ()
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{
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add (_label);
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Event.connect (sigc::mem_fun (*this, &Button::event_handler));
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_label->Event.connect (sigc::mem_fun (*this, &Button::event_handler));
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Rect r = _label->bounding_box ();
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_label->set_position (Duple ((width - r.width())/2.0, (height - r.height())/2.0));
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}
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void
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Button::compute_bounding_box () const
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{
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_bounding_box = Rect (0, 0, width, height);
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/* Item::bounding_box() will add children */
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set_bbox_clean ();
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}
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#define CORNER_RADIUS 5
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void
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Button::set_size (double w, double h)
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{
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width = w;
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height = h;
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set_bbox_dirty ();
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redraw ();
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}
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void
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Button::set_label (std::string const & str)
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{
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_label->set (str);
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/* move to recenter */
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Rect r = _label->bounding_box ();
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_label->set_position (Duple ((width - r.width())/2.0, (height - r.height())/2.0));
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redraw ();
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}
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void
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Button::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
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{
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Rect self = item_to_window (_bounding_box, false);
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Rect draw = self.intersection (area);
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if (!draw) {
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return;
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}
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double cr, g, b, a;
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context->save ();
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context->set_operator (OPERATOR_OVER);
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/* basic (rounded) rectangle, with pattern to fill */
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rounded_rectangle (context, self.x0 + 2.5, self.y0 + 2.5, width - 4, height - 4, CORNER_RADIUS);
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if (highlight) {
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context->set_operator (Cairo::OPERATOR_OVER);
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context->set_source_rgba (1.0, 0.0, 0.0, .2);
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rounded_rectangle (context, self.x0 + 2.5, self.y0 + 2.5, width - 4, height - 4, CORNER_RADIUS);
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context->fill();
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}
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if (prelight) {
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context->set_operator (Cairo::OPERATOR_OVER);
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color_to_rgba (contrasting_text_color (color.color()), cr, g, b, a);
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context->set_source_rgba (cr, g, b, 0.1);
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rounded_rectangle (context, self.x0 + 2.5, self.y0 + 2.5, width - 4, height - 4, CORNER_RADIUS);
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context->fill();
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}
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context->restore ();
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Item::render_children (area, context);
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}
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void
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Button::set_highlight (bool yn)
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{
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if (highlight != yn) {
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highlight = yn;
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redraw ();
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}
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}
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bool
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Button::event_handler (GdkEvent *ev)
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{
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if (ev->type == GDK_ENTER_NOTIFY) {
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prelight = true;
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redraw ();
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} else if (ev->type == GDK_LEAVE_NOTIFY) {
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prelight = false;
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redraw ();
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}
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return false;
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}
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std::string
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Button::label() const
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{
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return _label->text();
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}
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69
libs/canvas/canvas/button.h
Normal file
69
libs/canvas/canvas/button.h
Normal file
@ -0,0 +1,69 @@
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/*
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Copyright (C) 2011-2013 Paul Davis
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Author: Carl Hetherington <cth@carlh.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#pragma once
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#include <cairomm/pattern.h>
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#include "canvas/visibility.h"
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#include "canvas/rectangle.h"
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#include "canvas/types.h"
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namespace Pango {
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class FontDescription;
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}
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namespace ArdourCanvas
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{
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class Text;
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class LIBCANVAS_API Button : public Rectangle
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{
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public:
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Button (Canvas*, double width, double height, Pango::FontDescription const &);
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Button (Item*, double width, double height, Pango::FontDescription const &);
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Button (Canvas*, std::string const &, Pango::FontDescription const &);
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Button (Item*, std::string const &, Pango::FontDescription const &);
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void render (Rect const &, Cairo::RefPtr<Cairo::Context>) const;
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void compute_bounding_box () const;
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void set_label (std::string const &);
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std::string label() const;
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Text* text() const { return _label; }
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void set_size (double w, double h);
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void set_highlight (bool);
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private:
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double width;
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double height;
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Text* _label;
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bool prelight;
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bool highlight;
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bool clicking;
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Gtkmm2ext::HSV color;
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bool event_handler (GdkEvent*);
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void init ();
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};
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}
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@ -20,6 +20,7 @@ canvas_sources = [
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'arc.cc',
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'arrow.cc',
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'box.cc',
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'button.cc',
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'canvas.cc',
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'circle.cc',
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'container.cc',
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